AUDIOTEK AT-SN4BT Universal Bluetooth Audio Adapter

The AUDIOTEK AT-SN4BT is a universal Bluetooth audio adapter designed to add wireless music streaming to an existing car, boat, RV, or motorcycle audio system. It is intended for systems using a 3.5 mm auxiliary audio connection rather than replacing the radio itself. The adapter lets a compatible Bluetooth-enabled mobile device send music to the connected sound system.

This adapter is a practical option for listeners who have an older head unit without built-in Bluetooth. It supports Bluetooth 4.0 music streaming and uses the A2DP audio profile for wireless playback. Music selection and volume adjustment are handled from the paired mobile device.

The AT-SN4BT is designed for a clean installation with the receiver concealed behind a dash, panel, or other protected location. Its compact, hidden-install approach can help retain the factory appearance of a vehicle or vessel. The product is described as waterproof and suitable for marine applications, although no IP rating is published.

For day-to-day convenience, the adapter supports automatic switching and reconnection to the last paired device. It can connect with multiple Bluetooth devices, but only one device can stream audio at a time. If the active device remains disconnected for more than one minute, the adapter enters pairing mode.

The AT-SN4BT fits into a system through USB power and a 3.5 mm audio connection to the radio or sound system. It also provides an automatic 12-volt remote-output function while Bluetooth is active and music is playing. This makes it useful in installations where a connected accessory needs a low-current remote turn-on signal.

Key Features

• Bluetooth 4.0 Streaming: Adds wireless music playback from compatible mobile devices.
• A2DP Audio Profile: Supports Bluetooth stereo audio transmission for music listening.
• 3.5 mm Audio Connection: Integrates with compatible car and boat radios.
• USB Power Connection: Powers the adapter through a USB connection.
• Automatic Reconnection: Remembers and reconnects to the last paired device.
• 12V Remote Output: Provides a low-current remote signal during active playback.

Design & Installation

The AT-SN4BT is a compact receiver intended for concealed installation, helping keep the cabin or helm area free of visible cables and added controls. It is described as a rugged, waterproof marine-capable design for car and boat use. AUDIOTEK does not publish housing material, dimensions, or an IP water-resistance rating for this model.

Connect the adapter to USB power and route its 3.5 mm audio connection to a compatible radio or auxiliary audio input. Pair a Bluetooth-enabled phone, tablet, or media player, then control playback from that device. For the remote function, connect the 12V/12mA output only to an accessory circuit that accepts a low-current remote trigger.